Apparatus for forming bags



June 24, 1930. v K, MAIER 1,768,126

APPARATUS FOR FORMING BAGS Filed June 30, 1928 3 Sheets-.Sheet 1l IN VEN TOR.

A TTORNEYS June 24, 1930. f K. MAIER 1,768,126

APPARATUS FOR FORMING BAGS' l FiledJune so, 192s s sheets-sheet 2 l BY ATTORNEYS June 24, 1930. K. M AIEYR 1,768,126

APPARATUS FOR FORMING BAGS lFiled June 30," 1928 3 SheetsV-Sheet 3 .1NVENToR.

' ATTORNEYS Patiented June 24, 1930 OFFICE KARL 0F STUTTGART, GERMANY, ASSIGNOR T0 UNION SPECIAL MASCHIEN- FABBIK, lG'. II. B. H., 0F STUTTGART, GERMANY finmrus Fon romanze Tues Application led June l30, 1928, Serial No. 2,452, and in- Germany December 22, 1927.

The invention relates to new and useful improvements in an apparatus for forming bags. Prior to'this invention it has been customary to fold a strip about the edge portions of sections of material and to stitch the strip to the sections for reinforcing and enclosing the joined edges. The line of stitching passing through the strip into the edge portions )is inserted therethrough back from the edges of the lstrip and this leaves the edges free so that they often become bent outwardly and torn, particularly when paper .is used as 'the enclosing strip.

An object of the invention is to provide an apparatus forstitching a strip to sections of material for enclosing the edges thereof, which apparatus also applies an adhesive to the inner faces of the strip adjacent the edges so that the strip is not only secured to the edge portions by the stitching, but the eX- treme edge portions of the strip will be secured by the adhesive to the joined sections of material. 4

A further object of the invention is to provide an apparatus of the above type wherein the adhesive is applied tothe strip or the material and distributed thereon prior to the stitching of the parts. v

A further object of the invention is to provide an apparatus of the above type wherein the strip is folded about the edge portions and adhesive applied to the inner face of the strip adjacent the edges thereof as theV strip is led to the stitching mechanism.

A further object of the invention is to provide an apparatus of the above type having stitching units for simultaneously stitching the opposite edge portions of sections of ma-` terial for forming a bag with devices for guidinga strip to each stitching unit and for folding the same about the edge portions, and

also for applying an adhesive between the edge portions ofthe strips and the respective sections of thematerial being stitched so that said strips are not only stitched simultaneously to the sections of material, but the edge portions of the strips are also secured by l an adhesive to said sections of material.

These and other objects will in part be obvious and will in part be hereinafter more fully disclosed.

In the drawings Y Fig. 1 shows more or less diagrammatically partly in section and artly in plan a portion of an apparatus embodying the improvement.

Fig. 2 is an enlarged detail partly in section and partly in plan of one of the units for folding, applying an adhesive and stitching a further-modified form of apparatus.

Fig. 8 is a diagrammatic view showing the I arrangement of the pipes Ifor applying adhesive after the manner disclosed in Fig. 7.

' Fig. 9 is an enlarged sectional view through the sections of material with` the strips attached thereto by the lines of stitchingand the adhesive.

Fig. 10 is a view similar, to Fig. 9, but showing a modified arrangement of the adhesive.

Fig. 1l is a view partly in section and partly in front elevation of parts of the apparatus shown in Fig. 7.

Fig. 12'is a view similar to Fig. 11, but

showing a modified arrangement of the parts. The invention is directed to an apparatus fory forming bags orthe like from fabric, paper, or any other suitablematerial. The apparatus preferably includes two stitching units or sewing machines, which are right and left hand units and disposed so as to simultaneously stitch the opposite edges of sections of material for joining the edge portions thereof. Means is associated with each stitching unit for guiding a strip and folding p a strip about the edge ,portions of material for enclosing the edge portions. This means is located in advance of the stitching mehanism so that the line of stitching passes throughthe stri and secures the strip to the edge portions. l isposed in advance of the stitching mechanism are devices for applying adhesive between the inner faces of the edge portions of the `strip and the material to Whlc-h the strip is secured. l

According tocertain embodiments of the invention disclosed these devices apply the adhesive to the inner face of the strip, and according to other illustrated embodiments of the invention the devices apply the adhesive to the face of the material against which the edge portion is laid. In both instances, a distributing means is associated with each adhesive applying device so that the adhesive is properly distributed and placed for joining the edge portions of the strip to the sections of materialdieing joined.

' Referring more in detail to the drawings, the sections of material beingjoined are illustrated at 1. These sections are superposed one on the other. Encircling the edge portions of the sections of material at each side thereof is a strip 2. The strip is'folded about the edge portions and secured thereto by a line of stitching 7. The strips are led from a suitable source of supply about guide rollers 3, and thencethrough a folding device 4.

' There is a folding device for each strip and this folding device folds the strip about the edge portions. There are two sewing units indicated at 5. VThese sewing units are right and left hand and are disposed so as to simultaneously form the lines of stitching 7, 7 joining the strips to the sections of material. Each sewing unit includes a needle 6 and a presserfoot 18.' The folders 4 are located in advance of the presser foot so that the strip is folded about the edge portions of the material vand then passes beneath the presser foot lso that'the line of stitching passes both through thel strlp 'and the edge portions of the mate-v r1a Associated with each stitching unit and 'folder is a supply reservoir 8 for 'an adhesive material. The adhesive material may be forcibly fed -from the supply reservoir by any suitable means. As illustrated, Va feed screw is used which rotated by a belt wheel 10 from any suit-able source of power. The' pipeis indicated at 14. Said discharge nozzle is so positioned as to lay a stri 15 of i-lhcsivo against thc inner face of t ic strip 2 adjacent the edge thereof. A roller 16 en-` gages the strip of adhesive and 'distributes the same as indicated at 17. This distribution of the adhesive insures that the adhesive shall be'properly placed relative to the extreme edge of the. strip so that the adhesive will be entirely'covered by the strip.' The rollers 16 are carried by a supporting sleeve 19. Each vroller is mounted on a shaft which is free to rotate in thisfsleeve bearing. The sleeve bearings 19 are mounted at the outer end of a spring bracket 20 which is secured to the folder by a bolt v21. Flexing bolts 22, 22 pass through the spring bracket and bear against the outer Aface of the folder. By adjusting these bolts 22, 22 the pressure of the rollers 16 against the adhesive and the inner This i's brought about by the strip passing l `beneath the presser foot of the machine. It

is sometimes desirable to use additional means for placing the strip against the sections being joined .prior to the strip passing beneath the presser foot. In Fig. 5 of the drawings, I have shown a roller 23 mounted in suitable bearings, which roller extends across from one side of the apparatus to the other. The folders are removed from the presser feet of the sewing units a sufficient distance so as to `allow this roller to engage the material prior to the material passing beneath the presser feet. The roller rolls the edge portions of the strip in firm contact with the edge portions .being joined, after which they are stitched.

In Fig. 6 of the drawings,'I have shown a slightly modified arrangement of means for rolling the edgesA of the strip into contact with the edge portions of the material being joined. In this form of the invention a roller 24 is provided which is located directlyin front of the presser foot 18. Instead of having one long roller extending across the apparatus there is a separate roller associated with each presser foot. In Fig. 9 of thel drawings, a sectional view is shown through the stitched sections of the material. strip 2 is shown as folded against the edge portions of the sections being joined, the adhesive is indicated at- 17 and the line of stitching at 7. Through the combined action of the line` of stitching and the adhesive, the strips are secured to the opposite edges of the sections of the material encircling the edge portions thereof and firmly'outside the same. Not only does the adhesive prevent the edges of the strip from turning up, but it also makes a very tight seall preventing the The 4 escape of material from the bag through the f seam joining the side edge portions thereof. In the form of the lnvention shown in Figs.

7 and 8 the adhesive is applied to the material itself rather than to the strip which encircles the edge. -This is accomplished by pipes 25, 25. The nozzle end of each pipe' is placed close to the material and lays a strip of adhesive against the upper and lower faces of the material. A roller 27 lcarried by a yielding bracket 29 is associated with each nozzle and this distributes the coating as indicated at 28 in Fig. 7. After the adhesive is appiled to the edge portions of the material being joined the strip is laid around the edge portions and onto the adhesive and is then stitched. In Fig. 11 of the drawings the upper and lower rollers 27 for distributing the adhesive are shown in their position relative to the-line of stitching which is indicated by the broken line Instead of having a single strip of adhesive, a plurality of strips of adhesive may be placed between the strip and the sections of material being joined as shown in Fig. 10. It will be noted that these strips of adhesive are spaced from each other and the line of stitching 7 is between the adhesive strips. This laying of the adhesive is accomplished by providing additional pipes, one for each strip. In Fig. 12 of the drawings there is shown an arrangement of distributing rollers 3l, one for each of the adhesive strips which are indicated at 30. These rollers are carried by yielding bracket arms 82. The adhesive is applied by pipes as described above. When an adhesive strip is placed between the line of stitching and the extreme edges of the sections being joined, the strip is more firmly secured to the edge portions. j

It is obvious that minor changes in the details of construction may be made without departing from the spirit of the invention as set forth in the appended claims.

Having fully described my invention, what I claim as new and desire to secure by Letters 1. An apparatus for j oiniiig sections of material comprising a stitching unit, m'eans for directing a strip about the edge portion of the material and to the stitching unit, and means for applying a strip of adhesive between the line of stitching and the edge of the strip, said last named means including a pipe for applying a strip of adhesivedirectly to the strip and a distributing roll for distributing the adhesive prior tothe strip contacting with the edge portions to be joined.

2. An apparatus for joining sections of material 'comprising a stitching unit, means for directing a strip about the edge portion of the material and tothe stitching unit, Ymeans for applying a strip of adhesive di'- rectly to the under face of the strip adjacent each edge portion thereof prior to the stitching of the strip, and rollers adapted to engage the adhesive .on the strip for distribut' ing the adhesive.

3. An apparatus for joining sections of material comprising a stitching unit, a folder for directing a strip about the edge portion of the material and to the stitching unit, and means for applying an adhesive directly to the strip adjacent each edge of the strip as it passes through the folder and prior to the stitching of the strip.

4. An apparatus for joining sections of material comprising a stitching unit, a folder for directing a strip about the edge portion of the material and to the stitching unit, means for applying an adhesive directly to the strip adjacent each edge of the strip as it passes through the folder and prior to the stitching of the strip, and a roller adapted to engage the material to which the adhesive is applied for distributing the adhesive.'

5. An apparatus for joining sections of material comprising spaced stitching units for simultaneously stitching the opposite edge portions of the material, means associated with each stitching unit for directing the strip about the edge portion of the material to the stitching unit, and means associated with each stitching unit for applying the strip of adhesive between the line of stitching pipe aving a nozzle for applying a strip of adhesive directly to the strip and a roller associated with the nozzle for distributing the adhesive.`

6. An apparatus for joining sections of material comprising spaced stitching units yfor simultaneously stitching the opposite edge portions of the material, a folder associated with each stitching unit for directing a strip about an edge portion of the material and to the stitching unit, and means for applying an adhesive directly to the strip adjacent each edge of the strip as it passes through the folder and prior to the stitching of the strip. j

7. An apparatus for joining "sections of material comprising spaced'stitching units for simultaneously stitching thel opposite edge portions ofthe material, a folder associated with each stitching unit for directing a strip about an edge portion of the material and to the stitching unit, means for applying an adhesive directly to the strip adjacent each edge of the strip as its passes through the folder and prior to the stitching of the stripand a distributing roll for distributing a strip of adhesive.

8. An apparatus for joinin sections of material comprising spaced stitching units for 'simultaneously stitching the opposite edge portions of the material, .a folder a'ssociated with each stitching unit for folding a strip about the edge portionL of the material edge of the folder and disposed so as to apply adhesive to the inner face of the strip vadjacent the edge thereof, a yielding bracket attached to the folder, a roller mounted at each end of said bracket and en aging1 the inner face of said strip between t e ad esive supply pipe and the stitching mechanism for distributing the adhesive.

9. An apparatus for joining sections of material comprising spaced stitching units for simultaneously stitching the opposite edge portions of the materia a folder associated with each stitching unit for folding a strip about the edge portion of the material and directingthe same to the stitching unit,

an adhesive supply pipe extending about each edge of the folder and disposed so as t0 apply adhesive to the inner face of the stripv adjacent the edge thereof, a yielding bracket attached to the folder, a roller mounted at:

each end of said bracket andJengaging the inner `face of said strip between the adhesive supply pipe and the stitching mechanism for distributing the adhesive, and a roller lo `cated between the folder and the stitching unit for placing the strip against the material.

'In testimony whereof, I aix my signature.

' KARL MAIER. 

